uninstalling a program originally installed with InstallShield

I have a software from a vendor that is installed with InstallShield. I need to write a script to uninstall the software from everyone's computer silently. I can see the following path for the uninstall, "C:\Program Files\InstallShield Installation Information\{746CC629-4828-4E6C-842B-81BDDC3374FA}\Setup.exe" -uninst ", but I really need to do the precess silently. I have seen seeveral post about creating an answer file, but none of them work or they don't make since. I also assume that this package was created with an old InstallShield, but I can't confirm that.